Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o ICAO, quando o Aeroporto é "Aeroporto de Sibulan"?
 ###Tabelas: CREATE TABLE minister_for_community_safety_and_legal_affairs (minister_for_community_safety_and_legal_affairs_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Entered office VARCHAR, Left office VARCHAR, Party VARCHAR, First Minister VARCHAR) CREATE TABLE works_numbers (works_numbers_id AUTO_INCREMENT PRIMARY KEY, GE-DL works no. INT, Year built VARCHAR, Built for VARCHAR, Original no. VARCHAR, New owner VARCHAR, New no. VARCHAR) CREATE TABLE all_japan_university_rugby_championships_finals (all_japan_university_rugby_championships_finals_id AUTO_INCREMENT PRIMARY KEY, Title VARCHAR, Season VARCHAR, Winner VARCHAR, Score VARCHAR, Runner-up VARCHAR, Venue VARCHAR, Attendance VARCHAR) CREATE TABLE  (_id AUTO_INCREMENT PRIMARY KEY, City VARCHAR, Country VARCHAR, IATA VARCHAR, ICAO VARCHAR, Airport VARCHAR) CREATE TABLE lpga_tour_career_summary (lpga_tour_career_summary_id AUTO_INCREMENT PRIMARY KEY, Year INT, Tournaments played INT, Cuts made INT, Wins INT, 2nd INT, 3rd INT, Top 10s INT, Best finish VARCHAR, Earnings ( $ ) INT, Money list rank VARCHAR, Scoring average VARCHAR, Scoring rank VARCHAR)  
SELECT ICAO FROM  WHERE Airport = sibulan airport